SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd4101829d9dc10d4c292f1b5537900f7083477ff9abf48e18ae1ae5946b2a58' 
  AND token = 'KtGuS2w1QbVOrV6TLm1n8Dkfyzlx+SX1zBtEXBHhRmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}